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TUIBLH2024 |
eRHIC: An Efficient Multi-Pass ERL Based on FFAG Return Arcs | |
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| The proposed eRHIC electron-hadron collider uses a "non-scaling FFAG" lattice to recirculate 16 turns of different energy through just two beamlines located in the RHIC tunnel. This paper presents lattices for these two FFAGs that are optimised for low magnet field and to minimise total synchrotron radiation across the energy range. The higher number of recirculations in the FFAG allows a shorter linac (1.322GeV) to be used, drastically reducing cost, while still achieving a 21.2GeV maximum energy to collide with one of the existing RHIC hadron rings at up to 250GeV. eRHIC uses many cost-saving measures in addition to the FFAG: the linac operates in energy recovery mode, so the beams also decelerate via the same FFAG loops and energy is recovered from the interacted beam. All magnets will constructed from NdFeB permanent magnet material, meaning chillers and large magnet power supplies are not needed. This paper also describes a smaller prototype ERL-FFAG accelerator that will test all of these technologies in combination to reduce technical risk for eRHIC. | ||
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Slides TUIBLH2024 [1.907 MB] | |
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TUIBLH2025 |
Correction Methods for Multi-Pass eRHIC Lattice With Large Chromaticity | |
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Funding: The work was performed under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. The linear non-scaling Fixed Field Alternating Gradient (FFAG) design for eRHIC presents challenges as well as advantages. In this report, the challenge on orbit and optics corrections for eRHIC will be discussed and the solutions will be presented as well. |
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Slides TUIBLH2025 [2.222 MB] | |
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